Quick Summary
Federal tax planning strategy is only half of the picture for founders in California, New York, Washington, and other high-income states. State-level treatment of capital gains, qualified small business stock, and exit-related income varies significantly, and several of those rules changed in 2026. Understanding where your state stands on these issues before a transaction closes is not optional; it can change the fundamental economics of an exit.
The conversation about exit tax planning almost always begins with federal law: capital gains rates, Section 1202 exclusions, installment sale elections, and qualified opportunity zone investments. Federal planning is important, and for most founders it represents the larger dollar amount.
But for founders in a handful of states, the state tax treatment of a business sale can represent a second, equally significant tax event that receives far less attention until after the deal closes. In some situations, a strategy that is highly effective at the federal level actually creates a different result at the state level, and founders who are not aware of that distinction before signing make decisions they cannot reverse.
Covello Tax Law handles tax optimization for entrepreneurs and investors on a national basis. The state tax dimension of exit planning is part of every engagement where a client’s domicile creates a material state tax exposure.
California: The QSBS Problem
California is in a category of its own when it comes to QSBS planning.
The federal Section 1202 exclusion, which allows founders and early investors to exclude up to $15 million in capital gains per taxpayer per issuer from federal tax, does not exist in California. California never conformed to Section 1202. The state taxes the full gain on a QSBS sale at California’s ordinary income rates, which reach 13.3% at the top bracket.
This creates an outcome that surprises many California-based founders who have done excellent federal QSBS planning. A founder who qualifies for a full federal QSBS exclusion on a $15 million gain pays zero federal capital gains tax. The same founder, if a California resident at the time of sale, may owe approximately $2 million in California state income tax on that same gain.
For founders with much larger QSBS exclusions, the California gap is proportionally larger. A founder with $50 million in QSBS gains that are fully excluded at the federal level still faces a multi-million dollar California tax bill that no amount of federal planning will eliminate.
The planning response for California founders generally involves one or more of the following:
Domicile and residency analysis. California’s tax rules on when a taxpayer is a resident are aggressive and detailed. A founder who is considering a change of domicile before an exit needs to understand California’s specific standards for establishing nonresidence, the timing required for a change of domicile to be respected, and the risk of California asserting continued residency. This is a legal analysis, not simply a matter of moving.
Source income analysis. California taxes nonresidents on California-source income. For a business sale, the sourcing analysis determines how much of the gain has a California connection even after a domicile change. The rules are different for asset sales versus stock sales, and they are applied to each asset class individually in an asset sale context.
Timing the transaction. In some situations, the timing of the sale relative to a domicile change can affect California’s ability to assert tax jurisdiction over the gain. This requires careful coordination between the tax planning and the transaction timeline.
There is no simple answer for California founders, but there is an analysis that needs to happen before the transaction closes. Founders who address this question after the fact have significantly fewer options.
New York: A Proposed Change Worth Watching
New York historically has not conformed to the federal QSBS exclusion. New York residents who sell qualified small business stock pay New York state income tax on the full gain, at rates that reach 10.9% at the top bracket.
In 2026, there has been legislative discussion of a New York QSBS conformity bill that would bring New York’s treatment of Section 1202 gains into alignment with the federal rules. As of this writing, that bill has not been enacted, and the timeline for enactment is uncertain.
For New York-based founders approaching a transaction, the current state of play is that New York taxes the full gain. If the proposed conformity legislation passes, it would represent a significant benefit for founders who sell qualifying stock after the effective date of any new law. Founders with the ability to influence the timing of their transaction should be aware of this legislative development, though planning around legislation that has not passed carries obvious risk.
Financial advisors and CPAs working with New York clients on exit transactions should monitor the status of the proposed legislation and factor the current non-conformance into their planning models.
Washington: A Changed Landscape in 2026
Washington presents a different situation from California and New York, and one that has shifted recently in ways that are favorable to founders.
Washington enacted a capital gains tax in 2021, imposing a 7% tax on gains above $250,000 from the sale of assets including business interests. That tax generated significant legal and political controversy from the beginning. In 2025, Washington voters passed an initiative repealing the capital gains tax.
For Washington-based founders in 2026, the result is that there is no state-level capital gains tax on business sale proceeds. Combined with the federal QSBS exclusion for qualifying stock, this can represent a substantially better after-tax outcome than founders in California or New York experience from an equivalent transaction.
For founders who were in Washington during the capital gains tax years, understanding the applicable rules for those tax years and the interaction with their current planning remains relevant. For founders currently domiciled in Washington who are approaching a transaction, the state tax picture is now more favorable than it has been in several years.
The General Planning Framework for High-Tax State Founders
Regardless of state, the planning framework for any founder facing material state tax exposure on a business sale includes the following elements:
Confirming the state tax treatment of the specific gain. Not every state treats every type of gain the same way. The character of the assets sold, the structure of the transaction (asset versus stock), and the nature of the selling entity all affect how the state characterizes and taxes the gain. This analysis needs to happen before the deal structure is finalized.
Evaluating domicile. For founders who have flexibility about where they live, the tax consequences of a transaction vary significantly by state. The decision to change domicile, if it is on the table, needs to be made and executed with enough lead time to be legally respected. Last-minute domicile changes before a sale are routinely scrutinized by high-tax states with sophisticated audit programs.
Coordinating federal and state planning. Some federal strategies interact with state law in ways that reduce their effectiveness. The QSBS stacking strategies described in the QSBS stacking guide are highly effective at the federal level. In California, the same strategies do not reduce state tax liability, which affects the overall economic analysis of whether and how aggressively to pursue them.
Trust planning across state lines. For founders who are using trust structures in their exit planning, the state tax treatment of the trust itself is a separate and important question. Some states tax trusts based on the domicile of the grantor; others base taxation on the location of the trustee or the beneficiaries. Multi-state trust planning requires analysis of the trust’s state tax nexus, not just its federal tax status.
Installment sale and timing. For founders with state tax exposure, installment sale treatment can spread state tax recognition over time in some states. In other states, the full gain is recognized at closing regardless of when payments are received. The state-level treatment of installment sales is another area where federal planning assumptions do not automatically transfer.
The National Practice Advantage
One of the structural advantages of working with a firm that advises clients on a national basis is that state-level tax variations are part of the standard analysis rather than an afterthought. Covello Tax Law’s client base spans the country, and the state tax implications of exit planning are part of every engagement where state tax creates meaningful exposure.
That includes California founders wrestling with the QSBS conformance gap, New York founders tracking legislative developments, and Washington founders navigating the post-capital-gains-tax landscape. It also includes founders in states with nuanced sourcing rules, multi-state business operations, and complicated residency histories.
Working with Covello Tax Law on State Tax Planning
Dustin Covello advises founders and their advisors on the state tax dimension of exit planning as an integrated part of the overall strategy, not as a separate question that gets addressed after the federal planning is done. The goal is a complete picture of the after-tax outcome, including every state that has a legitimate claim on any portion of the gain.
For advisors in high-tax states who are regularly working with clients approaching liquidity events, the state tax component is often the area where client education has the biggest immediate impact on planning decisions.
Contact Dustin for a confidential conversation about your tax strategy. Email dustin@covellotaxlaw.com or use our secure form.
